When you boil these texts down to their basics, here's what you see (or what I see)... Incognito loved going out, especially to strip clubs. He invited Martin to join him on many occasions. Martin usually came up with an excuse why he couldn't go, whether it was...

"I don't like prostitutes."
"We have practice early in the morning."
"I have diarrhea."
etc.

At the very least to me it appears that incognito was under the impression they were friends. And that martin played in to the impression they were friends. Also if he hated martin and/or was racist against martin he wouldnt be inviting martin to party with him. He even talks to him about GTA. Obviously incognito was being friendly towards martin and martin betrayed him imo.

Richie Incognito: you pull any ass last night
Martin: Nah I was too wasted bro lol
Incognito: Hahaha! I was shitty too. Had a blast tho. What u doin today?
Martin: Sitting in James Bond right now, gonna run some errands. Do we have Tuesday off?
Incognito: No. We have Thursday off

That sounds like 2 friends to me.

After the scandal broke.
Incognito: What's up dude Glad to hear Ur ok I'm here if u ever need to talk. I've been through enough shit myself to understand.
Incognito: I miss Ur stinky armpits
Incognito: How u doing buddy? Feeling better?? I miss us
Martin: Wassup man? The worlds gone crazy lol I'm good tho congrats on the win
Incognito: Thanks dude It's unbelievable all the attention this is getting. All that's important is that you feel better and know we miss u dude

It continues on, but incognito comes off as really caring in this exchange.

Edit: at the very least even if martin was secretly offended by how incognito behaved. He should have come to Incognito's defense when the media was portraying him as a racist bully, who was bullying martin because of his race. Also how about at 1 point telling incognito he was being offended, incognito cant read his mind. He just let the media crucify incognito, with accusations he knew were false.

The media was killing incognito. Whitlock called incognito a prison yard bully. People were calling him a racist. Speculating he was intimated by martin's intelligence and hated martin, etc. It turns out he was constantly trying to get martin to party/hang out with him and the rest of the team. It's almost the opposite of what the media was reporting.

I dont think a racist white man would invite a black man to go party with him.